Human iPSC-derived cerebral organoids model features of Leigh Syndrome and reveal abnormal corticogenesis

BioRxiv : the Preprint Server for Biology
A. I. Romero-MoralesVivian Gama

Abstract

Leigh syndrome (LS) is a rare, inherited neuro-metabolic disorder that presents with bilateral brain lesions. This disease is caused by defects in the mitochondrial respiratory chain and associated nuclear-encoded proteins. We generated induced pluripotent stem cells (iPSCs) from three widely available LS fibroblast lines and identified, through whole exome and mitochondrial sequencing, unreported mutations in pyruvate dehydrogenase (GM0372, PDH; GM13411, MT-ATP6/PDH) and dihydrolipoyl dehydrogenase (GM01503, DLD). LS derived cell lines were viable and able to differentiate into key progenitor populations, but we identified several abnormalities in three-dimensional differentiation models of brain development. The DLD-mutant line showed decreased neural rosette (NR) formation, and there were differences in NR lumen area in all three LS lines compared to control. LS-derived cerebral organoids showed defects in neural epithelial bud generation and reduced size when grown for 100 days. Loss of cortical architecture and markers were detected at days 30 and 100. The MT-ATP6/PDH line produced organoid neural progenitor cells with an abnormal mitochondrial morphology characterized by fragmentation and disorganization, and demonstrated...Continue Reading

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